Check the listing for details. Tektronic Type RM 503 Oscilloscope. Condition: Used. Listed at 398.95 USD. Tektronic Type RM 503 OscilloscopeTektronic Inc. Portland Oregon USA19" Wide / 7" High / 18 1/2" DeepYear 1960 - 1971Valves/TubesThe type 503 is a monolithic oscilloscope specializing inX-Y Mode but also containing a sweep circuit with a bandwidth specification of 450 Khzand sensitivity to 1M V per centimeterCrt: flat faced accelerating voltage 3 KV, P2 phosphorP2 phosphor optimal for camera recordingP31 phosphor, optimal for eye viewing (Note the RM in Type RM 503 indicates that this unit is a rack version)The following electronic tubes are in this scope:6DQ6A,5651,6BL8,68C7,6DJ8,6DJ8,6DJ8,6CB6,Q454,6CB6,6DJ8[Ohm-M-30-FLOOR] This unit came from a defunct electronics lab.I have more pictures of scope if you need them, and feel free to ask questions about unit[Ohm-M-30]